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using {{Template:Jakob_Øster_1968}}
The widening of the foreskin also depends on age. A child's foreskin may be too tight to be retracted all the way past the glans, even though it has already completely separated from the glans. This early foreskin tightness, frequently confused with ([[phimosis]]), is a normal stage of development and vanishes with increasing age in most boys.
A study by the Danish paediatrician and school doctor, Jakob Øster, of 9,545 examinations of pupils, published in 1968, led to the following results<ref>{{REFjournal |last=Øster |first=J. |title=Further fate of the foreskinTemplate: incidence of preputial adhesions, phimosis, and smegma among Danish schoolboys |journal=Arch Dis Child |volume=43 |issue= |pages=200-203 |url=https://adc.bmj.com/content/archdischild/43/228/200.full.pdf |quote= |pubmedID= |pubmedCID= |DOI= |date=1968 |accessdate=Jakob_Øster_1968}}</ref>:
{|border='1' style='text-align:right' cellpadding='2'
''Tightness: Foreskin tightness hampering retraction''</blockquote>
Thorvaldsen & Meyhoff (2005) conducted a survey of 4000 young men in Denmark.9 They report that the mean age of first foreskin retraction is 10.4 years in Denmark.<ref name="Thorvaldsen">{{REFjournal
|last=Thorvaldsen
|first=M.A.